Bosch Plena Voice Alarm System Service Manual download pdf (Page 39)

Bosch Security Systems | 2004-06 | 9922 141 10371en

Plena Voice Alarm System | Installation and User Instructions | Installation en | 39

4.10.2 Connecting the mic/line input

with VOX functionality

The voice alarm controller has 1 mic/line input with

voice-activated (VOX) functionality (see figure 4.12).

This input has two sockets; one balanced XLR socket

and a balanced 6.3 mm jack socket. The signals from

both sockets are mixed to form a single input signal.

Typically, the mic/line input with VOX functionality is

used to connect an additional emergency microphone

or to interface with another emergency sound system

(e.g. a Praesideo system). Depending on the

configuration (see section 4.6), the mic/line input

automatically starts an emergency call if the input level

> -20 dBr

(100 mV for line and 100 µV for microphone) or if the

VOX switch is closed (see figure 4.13 for connection

details).

figure 4.12: Mic/line input with VOX functionality

LBB1990/00

Voice Alarm Controller

Calibration

Mic/Lin

GND

figure 4.13: Connecting a VOX switch

LBB1990/00

Voice Alarm Controller

123456

VOX Switch

123456

24V

DC out

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Bosch Plena Voice Alarm System Service Manual Page 39